Low Cycle Fatigue Behavior of a 10% Cr Martensitic Steel at 600°C

Mishnev, Roman; Dudova, Nadezhda; Kaibyshev, Rustam

doi:10.2355/isijinternational.isijint-2015-336

Cited by 15 publications

(12 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The number and depth of the dimples increase with mechanical strain amplitude increasing, as shown in Figures B and D. The concavity and formation of dimples around the inclusions are indicative of a high rate of crack propagation . Moreover, multiple short cracks come into being from the surfaces of specimens, and the neck shrinkage of the gauge length is more pronounced than that under IP TMF loading.…”

Section: Resultsmentioning

confidence: 87%

“…The concavity and formation of dimples around the inclusions are indicative of a high rate of crack propagation. 35,36 Moreover, multiple short cracks come into being from the surfaces of specimens, and the neck shrinkage of the gauge length is more pronounced than that under IP TMF loading. Thus, the plastic deformation and damage under OP TMF loading are more severe and the lifetime certainly short (Figure 11).…”

Section: Fracture Characteristicmentioning

confidence: 99%

See 1 more Smart Citation

In‐phase and out‐of‐phase thermomechanical fatigue behavior of 4Cr5MoSiV1 hot work die steel cycling from 400 °C to 700 °C

Pengpeng

Zeng

et al. 2017

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

The hysteresis loops, stress and strain behavior, lifetime behavior and fracture characteristic of 4Cr5MoSiV1 hot work die steel at a wide range of mechanical strain amplitudes (from 0.5% to 1.3%) during the in-phase (IP) and out-of-phase (OP) thermomechanical fatigue (TMF) tests cycling from 400°C to 700°C under full reverse strain-controlled condition were investigated. Stress-mechanical strain hysteresis loops of 4Cr5MoSiV1 steel are asymmetric, and stress reduction appears at high-temperature half cycles owing to a decrease in strength with increasing temperature. 4Cr5MoSiV1 steel always exhibits continuous cyclic softening for both types of TMF tests, and the cyclic softening rate is larger in OP loading condition. OP TMF life of 4Cr5MoSiV1 steel is approximately 60% of IP TMF life at the same mechanical strain amplitude and maximum temperature. Lifetime determined and predicted in both types of TMF tests is adequately described by the Ostergren model. Fracture surfaces under IP TMF loading display the striation and tear ridge, showing quasi-cleavage characteristics, and the cracks are less but longer. However, fracture surfaces under OP TMF loading mainly display the striation and dimple characteristics, and the cracks are more and shorter. KEYWORDS cyclic softening, cyclic stress-strain behavior, fatigue life, hot work die steel, thermomechanical fatigue | INTRODUCTIONDuring the die filling process, like die casting, hot extrusion, hot forging or hot stamping, the service life of hot work die is limited because of their extreme working environments in terms of the cyclic alternating high temperature, which results from the close contact between hot work die and hot work piece (1200°C for steel forging) or molten metal (675°C for Al-alloy casting, 930°C for Cu-alloy casting) and mechanical stress, leading to cyclic plastic deformation, which gives rise to crack initiation. [1][2][3][4] All along, the hot work die is damaged through a complex oxidation/wear/non-isothermal low cycle fatigue interaction. 5,6 Therefore, non-isothermal low cycle fatigue damage (occurrence of the cyclic reversed plasticity at low and high temperatures) of hot work die is usually called thermomechanical fatigue (TMF). According to incomplete statistics 7 , thermal cracking caused by TMF accounts for approximately 80% of the total failure die-casting dies. Thus, good TMF behavior can prolong the service life of the hot work die. However, the literatures about TMF behavior of hot work die steel are rarely found. 5,6,8,9 As TMF tests are time consuming and require expensive equipment, the fatigue life prediction with varying Nomenclature: ϕ, mechanical strain/temperature true phase angle; Δε mech , mechanical strain range; Δε mech /2, mechanical strain amplitude; R ε , strain ratio; (ε mech ) max , maximum mechanical strain; (ε mech ) min , minimum mechanical strain; T 0 , reference temperature; T max , maximum temperature; T min , minimum temperature; σ max , maximum stress; σ min , minimum stress; σ m , mean stress; Δσ, st...

show abstract

Section: Resultsmentioning

confidence: 87%

Section: Fracture Characteristicmentioning

confidence: 99%

In‐phase and out‐of‐phase thermomechanical fatigue behavior of 4Cr5MoSiV1 hot work die steel cycling from 400 °C to 700 °C

Pengpeng

Zeng

et al. 2017

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…"Bain" circles on the {001} pole figures are partially destroyed during tertiary creep, which provides evidence for slight re-orientation of the crystal lattice under creep [46]. No evidence of the formation of equiaxed subgrains [11,41] was found. A tendency for increasing the LAB fraction with a misorientation of 2°was evident during the transient and apparent steady-state stages of creep (Fig.…”

Section: Tmls During Long-term Aging and Creepmentioning

confidence: 92%

“…The microstructure and distribution of secondary-phase particles in the 10% Cr steel after heat treatment were described in previous works [12,29,34,37,41] in details and summarized in Table 1. The meso-scale strain distribution indicated by the KAM map (Fig.…”

Section: Tempered Martensite Lath Structurementioning

confidence: 99%

On the origin of the superior long-term creep resistance of a 10% Cr steel

Mishnev

Dudova

Kaibyshev

2018

Materials Science and Engineering: A

View full text Add to dashboard Cite

A low-nitrogen 10% Cr martensitic steel containing 3% Co and 0.008% B was shown to exhibit an extremely long creep rupture time of ∼4•10 4 h under an applied stress of 120 MPa at 650°C. The creep behavior and evolution of lath martensite structure and precipitates during creep at these conditions were studied. The main feature of the microstructure under long-term creep is retention of the lath structure until rupture. The following microstructural factors affecting the superior creep resistance were analyzed: (1) alloying by (W+Mo) elements; (2) particles of M 23 C 6 and Laves phases; (3) homogeneously distributed M(C,N) carbonitrides. It was revealed that nanoscale M 23 C 6 carbides and M(C,N) carbonitrides compensated the negative effects of W depletion from the solid solution and extensive coarsening of the Laves phase particles. M 23 C 6 carbides demonstrate a high coarsening resistance under creep conditions and exert a high Zener drag pressure before rupture because of the coherency of their interfaces. The strain-induced transformation of a portion of the precipitated V-rich M(C,N) carbonitrides to the Z-phase does not affect the creep strength because the Z-phase particles are nanoscale and negligible in quantity.

show abstract

“…The stress-based creep-fatigue equation is validated on GP91 casting steel, and the experimental data, including the creep-rupture data (Tabuchi et al., 2009), the creep-fatigue data (Mishnev et al., 2015; Mroziński and Golański, 2011) and the stress-strain data (Mishnev et al., 2015; Mroziński and Golański, 2011), are obtained from literature. The reference temperature is defined as 35% of melting temperature (Ashby et al, 2013), and the cyclic time is suggested as a small value.…”

Section: The Validation On Gp91 Casting Steelmentioning

confidence: 99%

Development of a stress-based creep-fatigue equation: Accommodating pure-fatigue to pure-creep for the high-cycle loading regime

Liú

Pons

2017

International Journal of Damage Mechanics

View full text Add to dashboard Cite

Background The creep-fatigue damage in low-cycle regime has been described by a strain-based creep-fatigue equation through integrating creep effect into fatigue damage. Need There is a need to develop a creep-fatigue equation which describes the stress-controlled creep-fatigue behaviour in high-cycle regime. Approach This stress-based creep-fatigue equation was developed through superposing a fatigue mechanism with a creep mechanism. This creep-fatigue equation was then validated on GP91 casting steel. The creep-fatigue data were transformed to the reference condition and collapsed into one power-law curve with good quality. Outcomes This result verified the formulas of the fatigue component and the creep component, and demonstrated the method of extracting the coefficients. The full-range characteristic of this creep-fatigue equation is discussed. In addition, the introduction of the compatibility presents a better description of the reference condition. Originality A new creep-fatigue equation is provided with demonstrably good ability to cover the full range of conditions from the pure-fatigue condition to the pure-creep condition for the high-cycle regime. The method of extracting the coefficients is also provided.

show abstract

Low Cycle Fatigue Behavior of a 10% Cr Martensitic Steel at 600°C

Cited by 15 publications

References 19 publications

In‐phase and out‐of‐phase thermomechanical fatigue behavior of 4Cr5MoSiV1 hot work die steel cycling from 400 °C to 700 °C

In‐phase and out‐of‐phase thermomechanical fatigue behavior of 4Cr5MoSiV1 hot work die steel cycling from 400 °C to 700 °C

On the origin of the superior long-term creep resistance of a 10% Cr steel

Development of a stress-based creep-fatigue equation: Accommodating pure-fatigue to pure-creep for the high-cycle loading regime

Contact Info

Product

Resources

About